On the outbreak of the World War I, the Territorial Force (TF) immediately mobilised for home defence, but shortly afterwards (31 August 1914), its units were authorised to raise 2nd battalions formed from those men who had not volunteered for, or were not fit for, overseas service, together with new volunteers, while the 1st Line went overseas to supplement the Regulars.

The Battalion War Diary complains that many of the TF men being received from the Gloucesters and Worcesters 'especially those sent from Bristol have ailments which will prevent them ever becoming efficient soldiers'.

[28] On 26 November 1917, 1212th (West Riding) Battery transferred to 43rd Brigade, Royal Field Artillery, which was reforming in 67th (2nd Home Counties) Division.

[11] In May 1918 each of the non-divisional home service brigades provided one Garrison Guard battalion to reconstitute the 59th (2nd North Midland) Division in France.

[31] On 24 April 1941, the 226th Brigade became part of the newly created Dorset County Division, which had taken over the operational commitments of Southern Area.